The ms. Firenze, Biblioteca Medicea Laurenziana, plut. 58.24 contains a collection of texts extracted from rhetorical works for some of which it is the only witness. Each passage displays a rhetorical figure or a metabasis, but their typology and arrangement within the collection remain unclear. This paper aims at illustrating the ways in which the compiler selected specific comparative formulas by analyzing some marginal notes and the source texts of the related excerpted passages.